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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 497 · 40 questions
TalentJR

Engineer's tip (Count the ropes): Fixed pulley: changes direction, effort = load. Pulley system: effort = load ÷ supporting rope sections; rope pulled = lift height × that number. Wheel and axle: MA = wheel radius ÷ axle radius; effort = load ÷ MA.

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  1. 1.🪝 A load of 1200 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  2. 2.🪝 A well winch has a handle (wheel) of radius 25 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  3. 3.🪝 A load of 580 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  4. 4.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
  5. 5.🪝 A winch has a wheel of radius 18 cm and an axle of radius 3 cm. What effort on the wheel lifts a 1080 N bucket on the axle, in newtons? (ideal)
  6. 6.True or false: a fixed pulley only changes direction. (a) False (b) True
  7. 7.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
  8. 8.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
  9. 9.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
  10. 10.🪝 A winch has a wheel of radius 10 cm and an axle of radius 5 cm. What effort on the wheel lifts a 200 N bucket on the axle, in newtons? (ideal)
  11. 11.🪝 A bucket weighing 250 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  12. 12.🪝 A winch has a wheel of radius 16 cm and an axle of radius 4 cm. What effort on the wheel lifts a 120 N bucket on the axle, in newtons? (ideal)
  13. 13.True or false: a movable pulley is on a flagpole top. (a) False (b) True
  14. 14.🪝 A pulley system lifts a 360 N load with an effort of 120 N. What is its mechanical advantage (MA)?
  15. 15.🪝 A bucket weighing 460 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  16. 16.🪝 A bucket weighing 300 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  17. 17.🪝 A load of 840 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  18. 18.🪝 A well winch has a handle (wheel) of radius 3 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  19. 19.🪝 A load of 600 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  20. 20.🪝 What does a single fixed pulley change? (a) the size of the load (b) the direction of pull (c) the colour of rope (d) gravity
  21. 21.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
  22. 22.🪝 A load of 750 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  23. 23.🪝 A winch has a wheel of radius 3 cm and an axle of radius 1 cm. What effort on the wheel lifts a 540 N bucket on the axle, in newtons? (ideal)
  24. 24.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
  25. 25.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
  26. 26.🪝 A winch has a wheel of radius 20 cm and an axle of radius 4 cm. What effort on the wheel lifts a 600 N bucket on the axle, in newtons? (ideal)
  27. 27.🪝 More rope sections holding a load means … (a) no change (b) less effort needed (c) the load floats (d) more effort needed
  28. 28.True or false: a movable pulley only changes direction. (a) False (b) True
  29. 29.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
  30. 30.🪝 A bucket weighing 440 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  31. 31.True or false: a movable pulley needs effort = load. (a) False (b) True
  32. 32.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
  33. 33.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
  34. 34.🪝 A bucket weighing 160 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  35. 35.🪝 A winch has a wheel of radius 14 cm and an axle of radius 2 cm. What effort on the wheel lifts a 210 N bucket on the axle, in newtons? (ideal)
  36. 36.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
  37. 37.🪝 A bucket weighing 230 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  38. 38.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
  39. 39.True or false: a fixed pulley needs effort = load. (a) True (b) False
  40. 40.🪝 A pulley system lifts a 300 N load with an effort of 150 N. What is its mechanical advantage (MA)?

Answer key

  1. 300
  2. 5
  3. 290
  4. 12
  5. 180
  6. True
  7. False
  8. 12
  9. True
  10. 100
  11. 250
  12. 30
  13. False
  14. 3
  15. 460
  16. 300
  17. 210
  18. 3
  19. 300
  20. the direction of pull
  21. a movable pulley
  22. 250
  23. 180
  24. 20
  25. False
  26. 120
  27. less effort needed
  28. False
  29. a fixed pulley
  30. 440
  31. False
  32. a fixed pulley
  33. 12
  34. 160
  35. 30
  36. a movable pulley
  37. 230
  38. 2
  39. True
  40. 2

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